The document introduces a LC2MOS octal 8-bit DAC chip called AD7228A. The chip features eight DACs and amplifiers, which allows for a reduction in board space requirements and increased reliability in systems using multiple converters. It can be operated with a single supply or dual supplies, and is compatible with microprocessors. The chip has a versatile control architecture and is designed for high performance and reliability.
The AD7228A is an octal 8‑bit voltage‑mode digital‑to‑analog converter that integrates eight DACs and output buffer amplifiers on a single chip. It supports single‑supply operation at +5 V, +12 V or +15 V, as well as dual‑supply configurations, and offers TTL/CMOS compatible inputs.
The document provides full electrical specifications, absolute maximum ratings, pin configurations for DIP, SOIC and PLCC packages, ordering information, and example interface circuits for various microprocessor families. It also describes unipolar and bipolar output modes, timing deskew techniques, and AC reference signal usage.
| Resolution | 8 bits |
|---|---|
| Total Unadjusted Error | 42 LSB max |
| Differential Nonlinearity | Guaranteed monotonic |
| Supply Voltage Options | Single +5 V, +12 V, +15 V or dual supplies |
| Maximum Ipp (positive supply current) | 22 mA |
| Maximum Iss (negative supply current) | 20 mA |
| Output Slew Rate | 2 V/µs min |
| Output Settling Time (full‑scale change) | 5 ps max |
| Maximum Sink Capability (single supply) | 400 µA at 25 °C |
It can operate with a single +5 V, +12 V, or +15 V supply, or with dual supplies.
The AD7228A contains eight independent 8‑bit DAC channels.
Each DAC channel provides 8‑bit resolution.
The maximum sink capability is 400 µA at 25 °C.